All in all, Rosaly Lopes, planetary geologist at NASA’s Jet Propulsion Laboratory, has toured 63 active volcanoes and lava lakes — research that helps her better understand such infernos on other planets and moons across the solar system. That dangerous region in Ethiopia, for example, is dotted with yellow and green hot springs that bear striking similarities to Jupiter’s sulfur-studded moon, Io. And Laki, an ancient volcano in Iceland — which last erupted over 200 years ago, spewing a poisonous fog that smothered the globe for nearly a year — looks remarkably similar to a feature on Saturn’s moon Titan.